On the Knights of Noromath server, we have created support for several undead templates or conditions that can be acquired through the course of play. Some information about the specific spells which have been changed to provide this support is included in our Spell Changes post (this site).
These creatures have long existed in the Realms and sages often debate their true nature and purpose. Some claim they are powered by the raw essence of vengeance itself. They are undead creatures with few weaknesses. They are affected appropriately by all spells that should affect them differently and are immune to such effects as they should be, respectively.
These are the still-living victims of vampires, who have acquired some degree of vampiric affliction themselves. This alarming condition may be unique to certain strains of vampirism existing in the Empires of the Sands. It may be difficult or impossible to detect.
These creatures are well known in the Realms for their wickedness and yet there are still lineages of them which have endured for thousands of years. Finding ways to exist alongside their prey, vampires are perhaps among the insidious foes among the undead. With very specific magical training such as that provided by paladin orders operating in the areas around Amn, Calimshan, and Tethyr, individuals from those orders have been known to identify vampires even through their disguises.
This terrible state of being is rumored to be the soul of a vampire, separated from its physical body and usually by way of sunlight. It is the vilest state of existence and worse than any death in any hell. Crimson Deaths are forced to languish in swamps where they suck the blood from the unfortunate creatures they prey upon, perhaps forever.
Support for arch-liches, liches, and demi-liches is planned.